Accord Euro

Hi Recently bought a 2005 Accord Euro - Australian compliance. Had it less than a month and have notice a couple of things that I would like some clarification on:
1. A vibration occurs in the drivers side a/c vent. It is not persistent, but seems to happen generally when taking the foot off the accelerator. 2. I purchased the car with after factory tinting. There is something near the door latch that is scratching the tint/glass (on the inside). The passenger side window has a "mark" that goes the height of the window, almost dead straight. The drivers side window is actually "scratched" (well I think the tinting anyway). There are about three scratches about 1-2" in length. Two of the scratches are about 2" apart. The other one slightly below one of the others. 3. I have never driven a Honda or a VTEC car for that fact before this car. I have noticed that when maintaining speed, the car accelerates a little almost like it is on cruise control. Is this normal? (6 speed manual). Any help on these would be appreciated. Thanks Dominic

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